Metal-cutting band-saw.



H. C. WILLIAMSON. METAL CUTTING BAND SAW.

rvucmou FILED: MAR. a. 1913.

Patented July 17, 1917.

4 SHEETS-SHEET I HHHIHU o'wwfon' llllHlllILHllllllTm H. c. WILLIAMSON.

METAL CUTTING BAND SAW. APPLICATION men MAR. a. 1913.

Patented July 17, 1917.

H. c. WILLIAMSON.

METAL CUTTING BAND SAW.

APPLICATION FILED MAR. 8. I913.

Patented July 17, 1917.

4 $HEETSSHEET 3- Jim I 17 vefifor'."

Patented July 17, 1917.

4 SHEET$-SHEET 4- 1TB sumlmmm [H llllllllllllllll HERBERT o. wriinmtli'sou, OF CHICAGO, IIinrNo-is.

nitrat on-mine BAND-SAW.

Specification or Letters- 1 mm.

PaiteiitedJulyd W,W917.

Applicationfiled March8, 1913. sm-m1 no. 7525898.

To all whom it may concern:

Be 'itlrnown i the t I, I-lmum-R'r C. WIL rii'M- son, a Citizenotthe :Unite d States, residing at Chicago,-in the county oiFCook and State of Illinois, have invented certain new and useful Improvements in Metal-Cutting Band-Saws, of which the following is a specification.

This invention relates to improvementsin metal cutting band saws, and has for its object to provide an improved form of metal cutting band saw which will be capable ot use for cutting metal stock, or other material, of practically any thickness; l'litherto the majority of stock cutting-hasbcen done by reciprocating hack saws which are mechanicallyimpracticable, as is well-known in the trade. Band saws oiconventional con struction have been used for cutting wood and similar soft materials, buthaye proved impracticable when-used for metal cutting, in View oiithe fact that the ordinary wood cutting band saw is simply mounted upon two spaced apart vertical pulley wheels, so that the length of material to be cut off is li-mited by the diameter ofthe pulley wheels, and the cutting oflong stock is impossible without making a double cut, that is to say, cutting a section out ofthe stock byusingboth portions ofthe saw. Furthermore, this type of band saw has required moving of work against the band requiring considerable power when the material is heavy and also tending to break the saworthe teeth thereof. Other forms of band saws have necessitated sharp twistingo f theiband adjacent the cut ting point thus tending to destroy or shorten the life of the saw. My device capable of cutting off stock from material of any length andv ot practicallyany Width, as will be obvious from-the following description. 7

Another object of my invention is to .provide an improved device of the class "do scribed which will automatically feed itself across the material when the latter is being cut, and which will prevent the saw mecha nism from traveling too far at the completion of the out should an operator not be at hand.

Still another object of my invention i-s the arrangement and constructirm of means to guide and support the saw near the cutting point thereof. Other objects will be made apparent and Set "forth 'in the allowing specification and accoi'npanying drawings, in which Figure '1 is 'a side elevation of my iin proved machine showiiig the saw guidin means broken Off. I

,ljig. 2,11 front 'eleyation oftli'e same;

Fig.3, a plan view;

Fig. 4, a detail of'the fraine'iiiountiiig;

Fig. 5,.adetail of the. frame check F1), a planvie'w or; he same; I

Flg. 7, a detail partially in sectionof the drive shaft nounting l Fig. 8,:adetai1 of'tlieb'and saw-tightening means;

Fig. 9, an eiideleVatioi1 of the,seni e.

Fig. 10, amend elevationpartiallfy insection, of the saw guiding means;

*Fig. 11,.a side elevation oftlie's'ame;

Fig. 112, an enlarged side elevation of a detail of the same; p

13, an end elevation of the latter;

V Fig. '14, a cross-section along liii'e l t- 14 of Fig. 13; I T

Fig. 15, a side elevation of a 'i'nodification of the tilting frame retarding means and table; and A Fig. 16, a front View of thesame.

Like numerals refer to like elements throughout the drawings, in which 1 0 designates generally what I 'teii'i'i the fixed supporting frame liavingith'ejbase pedestals 11 from which supporting braces 12 extendgupwardly, as shown in Figs. 1 j n89. These braces 12am "inclined slig showi1and carry at their u 11J pei'fp'Orti'on, and are preferably tormedi'ritegnl with, a horizontal w b rk carrying table 13. This table is provided with the upiv'ardly eix'telid ing shoulder l-lat fon'c edge, to the rear side of which is secured a detacliabl'e"bracket 15 from which extends upw ai-d 1y an ariii 1 6. On this arm :16 is adjustably immn'teil a clan-1 ing arm adapted to he secured'iii adjusted position on tliearm 16 by a set screw :18. The arm 17 overhangs and is parallel to the surface of the table 13, and provided with the threaded apertures 19 in which is adapted to thread a set screw 20 "to engage work carried by said table fa'iidsecu're the same clamped at the top, if so desired. A hearing bracket 91 is 'locatecfl. at tli'eifroiit edge of the table 13 and is threadabl'y "en,- gaged by the rod 22 which is rota titbly b notreciprocably, mounted in the claiiilpl'ng ."ties of the legs 12 are provided shoulders 27 jaw 23. At, its outer extremity the rod 22 carries the operating handle 24 pivotally mounted thereon. The operation of this clamping means being well known in the art, it is not believed necessary to further describe the construction thereof.

' In Fig. 1, I have shown a round bar 25 carried upon'the face of the table 13 and held in place against the shoulder 14 by the clamping jaw 23. Intermediate the extremi- "upon which are secured, by screws 28, the

bearing member 29, shown in Figs. 1 and 4. The bearing member 29 carries a sleeve memleer 30 and 1s apertured at 31, as indicated by dotted lines in Fig. 7, and also has a slightly reduced portion 32 extending outwardly at one side thereof upon which is j ournaled the elbow 47, see'Figs. 2 and 7 This shouldered member 30 is apertured throughout its length. A pair of these bearings is provided to coact with each of the bearings 29, as shown most clearly in Fig. 2. A drive shaft 33 extends through and is j ournaled in the bearing members 30 and is provided at one extremity outwardly of said adjacent member with a driving pulley 34 V place thereon by the retaining collar 42, as

. slipping off.

-- shown in Figs. 1 and 2. This pulley 40 is provided at one end with a peripheral flange '43 adapted to restrain the band saw 44 from '45 designates generallygivhat I term the tilting saw frame, and comprises a pair of horizontally (disposed portions 46 and 47 upper and lower, respectively, and a'pair of curved portions 48, 49 extending between said horizontal portions, as shown in Figs. 1 and v2. These portions 48and 49 are curved, as shown in Fig. 1, to permit the tilting frame to swing over the table without contacting therewith. The spindle 41 is se- "cured to and depends from the annular elbow 47 and portion 47 of the frame 45. At

I its other extremity the portion 47 V is provided with the downwardly extending elbow 47 ap'e'rtured to fit overand rotate upon the portion 30 of one of the bearings 29. Intermediate of this extremity and the elbow 47 is the downwardly extending elbow 47 suitably 'apertured to be mounted upon and rotate upon the portion 30 of corresponding bearing 29.. Near one extremity of the portion 46 of the frame is the horizontally disposed pulley wheel50 having the peripheral flange 51,'and located by the slidable bracket 53. This bracket is slidably mounted upon the bearing plate 54 secured to the upper surface of cross frame portion 46 and projects outwardly on either side thereof, as shown in Fig. 9. The sliding bracket 53 is provided with an over turned flange 55 embracing one overlapping side of plate 54. The bracket at its other side extends around the overlapping side of plate 54 beneath the cross frame portion 46, and is provided with the threaded aperture 56, as shown in Fig. 9. A threaded rod 57 engages the threaded aperture 56 and is provided at one extremity with the operating handle 58 secured thereto by set screw 5!). Adjacent its other extremity the rod 57 is mounted in the depending lug 59 of cross frame portion 46 and is prevented from reciprocation with respect thereto by the collars 60 located on either side of the ing 59 and secured to the rod 57.

It will be apparent that upon rotation of the wheel 58 the bracket 53 and fixed spindle 52 will be moved in the direction desired, thereby increasing or decreasing the tension in the band saw 44. Located adjacent the other extremity of portion 46 and disposed horizontally is the hearing (31 in which is secured the fixed spindle 62 projecting outwardly therefrom at opposite sides a considerable distance, as is shown most clearly in Fig. 3. A pulley wheel 63 is rotatably mounted at each extremity of the spindle 62 and is retained in place thereon by the spaced collars 64, or etc. These pulleys (53 are located in approximately vertical planes when in operative position and are also provided with the peripheral flanges 65. A pair of vertically disposed pulleys 66 are similarly supported upon fixed spindle 67 projecting horizontally from the cross frame portion 47 and are preferably located below and in the same planes with the upper pulley wheels 63. These pulley wheels ()6 are also preferably flanged as at (38. The saw is mounted as shown in Figs. 1, 2 and 3 to travel preferably in the direction indicated by the arrows, and it will be noted that the travel is from the far side of the driving pulley 40, as viewed in Fig. 2, to the correspending of pulleys 66, to corresponding of pulleys 63, back around the far side of pulley 50, as viewed in Fig. 2, around the latter to and partially around the nearer of pulleys 63, and down to and partially around the nearer of pulleys (36, as viewed in Fig. 2.

It will be noted that a quarter twist is imparted to the saw band when leaving and when approaching band pulley 40 and when leaving and approaching pulley 50, these pulleys-being located with their planes tangential to the peripheries of the pairs of pulleys 63 and66, as is clearlyshowniin the drawings. It will be apparent that by virtue of the twists given to the saw band, the runs or portions of the latter traveling between pulleys 63 and 66, indicated by letters a and Z), respectively, (see Figs. 1 and 8), will be plane portions and travel at right angles to the plane of the table 13, and by means of the twist which I impart to the band saw portion or run a (see Fig. 2), will run with its toothed edge facing toward the observer, as viewed in Fig. 2, as is necessary for the cutting of the bar or other material 25. The portion or run b of the band saw will be located with its teeth facing the opposite direction, although it may be reversed if so desired. The table 13 is provided with a slot 13 in which the portion a of the saw is adapted to travel (see Fig. 3). An arm extends toward the operator from the cross frame portion 16 and is provided with a handle 71. A check rod 72 is pivotally mounted at one extremity to the lug 73 carried by a frame portion 49. This check rod is provided with the cross pin 7 L adjacent its outer extremity and is mounted in a slot 75 in the downwardly extending strip 76, which in turn is secured by bolts, or etc. 77, to the shoulder 14. The strip 76 extends downwardly below the under surface of the table, as shown in Figs. 1 and 5. On the opposite side of the strip 76 from the pin '74: is the adjustable collar 78 adapted to be held in adjusted position by the screw 79. A spring 80 is coiled aroundthe rod 72 between the strip 76 and collar 78. It will be apparent that by adjusting the collar 78, the travel of the tilting frame and consequently the cutting portion or run a; of the saw may be limited as desired, the spring 80 serving to cushion the saw and frame when such limit of travel is reached.

I preferably construct the portions 4-8 and 19 of the saw frame .curvedas shownto permit their clearance of; the table and work supportingportion of my machine when the saw frame is tilted over. Furthermore, the whole construction is preferably designed with a view of locating the center of gravity of the tilting mechanism so that the weight of the latter will operate to feed the saw across the work, and after having been started thereon by tilting the tilting frame over, through the medium of arm 7 0 and handle-71, to counter act the increasing force exerted as the center of gravity moves over, I provide, a fixed arm projecting outwardly from'the cross portion 4:? of the tilting frame. This fixed arm has pivotally secured at its outer extremity oneend of a coil spring 86, the other end of which is pivotally linked to one end ofa second similar spring 87, whichin. turn'has its upper-endpivotally linked to a 3in.8 8.carried between lugs-89 in the under surface of the table 13. It will be apparent that PlSlEhGrCGIItQI' of-gravity .is moved toward tl1e-table,thepressure exerted upon thecut ting portion or run a of sthe :saw .will be normally increased, but as a predetermined point is reached the springs 86iand 87, actingrthrough the arm 85, tendto balance or counteract a portion of the weight of the tilting frame, this counterbalancing force increasingasthe center of gravity is :further displaced. y

it will be obvious that while I have shown two coiled springs, I may use a single spring, 86, as shown in Fig. 15, although I find that by the use of the double spring shown the counter-balancing effect does not take place until a certain point in travel is reached but when it is exerted, it is exerted with greater strength than by the use of a single spring since I may use comparatively stifi springs.

It will be apparent that plane portions or runs a and b of the saw will :lie in substantially the same plane in the form of my device illustrated, and it will be further apparent that the length of work to be cut is unlimited .and that the thickness of metal or work to be cut is only limited by the possible interference of the portion Z) of the saw. This limit may be increased by increasing the size of the pulleys 410 and 51, as is obvious. Should the band saw become slack, the tension therein may be increased by operation of the adjustingrod 57 through the medium of wheel 58.

Inasmuch as the saw is liable to buckle and be forced back from the work, I find it desirable to provide means to overcome these actions, as 'is shown in Figs. 10 to ll, where 90 designates an integral arm depending fromadjacent one extremity of tilting frame portion 16. A strengthening web 91 extends between and is joined integrally with arm .90 and frame portion 46. The lower extremity of arm 90 is aperturcd at 92 and the reduced threaded end 94L of a rod 93 is inserted therethrough and secured in place by a nut 95 at one side, and a washer, 93, at the other. Thisrod 93 carries at its outer extremity a block 96, vertically slotted at 96. Cross holes 97 extend from one side of block partially therethrough and transversely-intersect slot 96, as shown in Fig. l l. Hardened metal rollers 98 are rotatably mounted in these holes, and are held therein by the plate 99 secured to the face of block 96. The block 96 is located not far above. the table, and the portion a of the saw band runs in the slot 96 with its rear or untoothed edge adapted to contact with rollers 98 when cutting work, whereby the ed ge of the saw-band will not become roughsov ened and worn, andfriction will be greatly reduced. The sides of the slot 96 serve to prevent turning of the saw band when cutting.

Y lVhen work or material of considerable weight is to be cut, I -find it desirable to afford additional supporting and strength ening means for the table 13, as shown in Figs. 15 and 16. I extend the web 100 outwardly fromone of the braces 12 as shown, .to furnish a rigid support. Adjacent the other end of the table, I provide a leg 101 reduced at its upper end andpivotally supported by the pin 102 between lugs 103 depending from the table. Threadably mounted on the opposite end of leg 101, which terminates just short of the base flange 11, is a nut 1041. The leg 101 is adapted to be swung clear of base flange '1-1' when the saw band is to be placedin position or removed therefrom, after which it is dropped to position shown, and the nut 10 1 screwed downwardly to contact with the base of flange 10.

To reinforce the table 18 where slotted, a pair of washers 110 are located one above and one beneath the table as shown in Fig. 10, and a bolt 111 is inserted therethrough and clamps them together by means of the threaded nut 112 carried thereby.

Further explanation of the operation of my improved device is believed to be unnecessary. It is to be noted that while I have shown and described my machine with more or less particularity, I do not wish to be unduly restricted thereto beyond the scope of the appended claims.

What I claim is:

1. In a device of the class described, an endless saw band, said band being provided with. a cutting edge, a saw driving and supporting means, said saw being mounted upon said means with a pair of runs lying in substantially the same plane. I

2. In a device of the class described, an endless saw band, said band being provided witha cutting edge, a saw driving and supporting means, said saw'being mounted upon said means with a pair of runs lying in substantially the-same plane, said runs having their cuttingedges facing in opposite directionsr 3. In a device of the class described, a table, an endless saw band, said band being provided with acutting edge, a saw driving andv supporting means, said saw being .mounted upon said means with a pair of runs lying in substantially the same plane, said runs being located in a plane approximately perpendicular to said tableand having their toothed edges facing in an opposite V i direction.

. 4. In a device of' the class described, an endless saw band, means to support and A drive said saw, said saw being mounted upon sa dv means wlth a pair of runs lying in substantially the same plane, a work-carrying table,one of said runs of said saw band being located adjacent said table and ada )ted to move transversely relative to said table.

5. In a device of the class described, a work-carrying table, a band saw, a. saw supporting and driving means, said band saw being supported upon said means with a pair of runs lying in approximately the same plane, one of said runs being located adjacent to said table and adapted to be moved thereacross.

6. In a device of the class described, a work-carrying table, a band saw, a saw supporting and driving means, said band saw being supported upon said means with a pair of runs in approximately the same plane, one of said runs being located adjacent said table and adapted to be moved thereacross, and means to secure work or material to be out upon said table.

7. In a device of the class described, a fixed frame, a table carried by said frame, a tilting frame pivotally mounted upon said fixed frame, saw carrying and driving means carried by said frame, a band saw mounted upon said means with a pair of runs in a plane approximately perpendicular to that of said table, said tilting frame being adapted to tilt to move one of said portions across said table when cutting work.

8. In a device of the class described, a fixed frame, a work-carrying table carried by said frame, a tilting frame pivotally mounted upon said fixed frame, saw carrying and driving means mounted upon said tilting frame, a band saw mounted on said means with a pair of runs lying in a plane substantially perpendicular to the plane of said table, the run of said saw adjacent said table being mounted with the toothed edge thereof to Ward said table, whereby when said tilting frame is tilted said cutting edge of said lastnamed portion will be moved across said table to out work carried thereby when said saw is running.

. 9. In a device of the class described, a fixed frame, a work-carrying table carried by said frame, a tilting frame pivotally mounted upon said fixed frame, saw carrying and driving means mounted upon said tilting frame, a band saw mounted on said means to run with runs thereof spaced apart and in a plane substantially perpendicular to the plane of said table, the run of said saw adjacent said table being mounted with the toothed edge thereof facing toward said table, whereby when said tilting frame is tilted said cutting edge of said last-named run will be moved across said table to out work carried thereby when said saw is running, and means to limit the movement of said tilting frame in either direction, said. means being adjustable to vary amount. of

cutting travel.

10. In a device of the class described, a fixed frame, a work'carrying table carried by said frame, a tilting frame pivotally mounted upon said fixed'frame, saw carrying and'driving means mountedupon said tilting frame, a band' saw mounted on saidmeans to run 'w'itli'runs thereof spaced apart and lying in a-plane substantially perpendicular to the plane of said table, the'run of'said saw adj acentsaid table beingmounted with the toothed edge thereof facingto- Ward said table, whereby when said' tilting frame is tilted said cutting edge of said last-named run will be moved acrosssaid table to "cut-work carrie'd thereby when said saw is running, and means to gradually check the movement of said tilting frame when being moved across saidtable in cutting operation.

11. In a device of theclass described, a

'fixed frame, a work-carrying table carried by said frame, a tilting frame pivotally mounted upon sa1d fixed frame, saw carrymg and drlvingmeans moimted upon said tilting frame to run with runs thereofspaced apart and lying in a plane substantially perpendicular to'the'plane of saidtab'le', the run of said saw adjacent said table being mo'untedwitlrthe tdothed edge thereof facingtoward said-table,- whereby when said tilting frame'istilted saidcutting edgev of saidlast named run will'be moved across said'table to cutworkcarried thereby when said saw is running,adjustable means to limit the movement-of said tilting frame in either direction, and a second'means to gradually checlrthe movement ofsaid tilting frame when moving across saidtable in cutting operation.

12. In a device of the class described, a"

fixed frame, work-carrying means carried by said frame, a tilting frame pivotally mounted upon said fixed frame, aisaw carrying and driving meanscarried by said tilting frame, said tilting framebeingmounted so that the center of gravity thereof will lie ono'ne side of said pivotal mounting when in inoperative position and on the other side of said pivotal mounting when in operation.

18. In a device of the class described, a fixed frame, a work-carrying table carried by said frame, a tilting frame pivotally mounted upon said fixed frame, saw carrying and supporting means carried by said tilting frame, a band saw carried upon said means to run with runs spaced apart and in a plane perpendicular to the plane of said table, one of said runs being adjacent said table and arranged to run with its cutting edg toward said table, said tilting frame being adapted to be tilted to move said cutting run of said saw across said table, said tilting frame and saw carrying means being located so that the center of gravity thereof will lie on the side of said pivotal mounting opposite to said table when in inoperative: position and upon the same side astsald table when in operation, whereby sald' cuttlngrunof said saw will be fed automatically across said table by the weight of said tilting frame and saw-carrymg 3 means when cuttmga 114; In a-device ofthe class described, a fixed frame, a tilting frame oscillatably cutting portion of said saw has been fed relativeto said work a certain distance by the weight of said frame and: carrying means.-;

15: In a device of the class described; a tilting frame pivotally mounted upon a fixed frame, said tilting frame being provided with a pair of pulley wheels horizontally disposedlione of said'pulley Wheels beinglo cated'adjacent the top of said tilting frame and the other of said pulley" wheels being locatedadjacent the bottom of said frame, a pair of vertically disposedpulley wheels rotatably mounted atthe upper portion'of saidtiltingframe, a secondpair of vertically disposed pulleys rotatably mounted on and located adjacent the bottom of said frame, said upper vertical pulleys being tangentialto'the plane of said upper horizontal pulley, said lower pair of vertical pulleys being located'tangential to the plane of said 'lOWBIl horizontal pulley, and a band. saw mounted upon'and to run betweensaid pulleys.

l6i-In a device of the class described, a fixed 'frame, a 'tiltingframe pivotally' mount ed upon said fixed frame, a drive shaft extending through and journaled in said pivotal mounting of said tilting frame, a saw carrying and driving means carried by said tilting frame, said means comprising a plurality of pulley wheels adapted to support a band saw with runs thereof in approximately vertical planes and spaced apart, one of said pulleys being provided with gear teeth on one side thereof, a driving pinion carried by said drive shaft and meshing with said teeth, and means to rotate said shaft and pinion and thereby said band saw.

17. In a device of the class described, an endless saw band, means to support said saw band, said means comprising a pair of acting with said first named pulleys and saw band, the latter being arranged to cut with the run between said first pair of pulleys, said run-running substantially in a plane. 7'

18. In a device of the class described, a pair of pulley members in approximately the same plane and spacedapart, a second pair of pulley members,;.said members being angularly disposed witl aj jespect to said first named pulley members and arranged each in a plane tangential to one of said first named pulley members, other supporting means, and an endless saw band being arranged to cut with the run running between said first named pulley members and supported by said pulleys and supporting means.

19. In a device of the class described, an

endless saw band, driving and supporting means for said saW comprising a pair of pulley members spaced apart, 'a second palr ofpulley members angularlydisposed With respect to said first named pulley members, other supporting means, said saw band running between and supported by said pulley members and. being arranged to cut With the run running between'said first named pullevfmembers and supported by said pulleys and supporting means.

"horizontally arranged pulley members, other supporting means, and an endless saw band runninglbetween said pulley members and 20. In a device of the class described, a pair I of approximately vertically arranged pulleymembers, a pair of approximately supported thereby, said saw band being arranged to cut with the'run running between said first named pair of. pulley members andsupported by said second named pair of pulleys andsaid supporting means.

.21. In a device of the class described, a tiltable frame, pulley members rotatably carried by said frame, a pair of said members being spaced apart, a second pair of said pulley members being angularly disposed with respect to said first named pair of pulley members, other supporting means, and an endless saw band running between and mounted upon said pulley members and arranged to cut with the run running between said first named pair of members, and supported by said pulleys and supporting means.

22. In a device of the class described, a pair of spaced apart pulley members located in approximately the same plane, a saw band running between and supported by said pulley members, a second pair of pulley members each located in a plane approximately tangential to one of said first named pulley members, and additional supporting means coacting with said pulleys to support said saw band, said saw being arranged to cut with the run running between said first named pulleys.

23. I11 a device of the class described, a pair of spaced apart pulley members located substantially in the same plane, a saw band running between and supported by said pulley members, a second pair of pulley members each located in a plane approximately tangential to one of said first named pulley members, additional supporting means coacting with said pulleys to support said saw band, said saw being arranged to cut with the run running between said first named pulleys, and means to drive said saw, said means comprising a gear carried by one of said pulleys, a pinion coacting therewith and adapted to drive the same.

In testimony whereof, I have subscribed my name.

HERBERT C. WILLIAMSON.

Witnesses HENRY A. PARKS, E. M. ANDERSON.

Oopiesof this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. C. 

